摘要
为提高碳纳米管在环氧树脂基体中的分散性,分别利用硅烷偶联剂(KH560)和双酚A型环氧树脂(E44)对酸化碳纳米管(a-MWCNTs)进行环氧化修饰,然后通过热压成型将其与邻甲酚醛环氧树脂(o-CFER)复合制备玻纤增强的复合材料,并对其进行了结构表征和性能测试。结果表明,分别与KH560、E44反应后,a-MWCNTs表面成功引入了环氧官能团;相比于未进行环氧化修饰的a-MWCNTs,加入环氧化修饰的碳纳米管使得o-CFER层压复合材料的热稳定性和玻璃化温度(T g)得到改善,体系交联度增加,力学性能呈现出先增强后减弱的趋势。当KH560-MWCNTs、E44-MWCNTs含量为1%(质量分数,下同)时,复合材料的T g分别提高了6.5℃和9℃。其中,KH560-MWCNTs改性体系的冲击强度最佳,且当KH560-MWCNTs添加量为1%时,该复合材料的冲击强度与玻纤增强纯o-CFER相比提高了129.1%;而E44-MWCNTs改性体系的拉伸强度最佳,且当E44-MWCNTs添加量为1%时,该复合材料的拉伸强度与玻纤增强纯o-CFER相比提高了29.9%。SEM分析表明,经环氧官能化的碳纳米管改善了其在o-CFER基体中的分散性以及基体与增强纤维之间的相互作用。
In order to improve the dispersion of carbon nanotubes(CNTs)in epoxy resin matrix,the acidified carbon nanotubes(a-MWCNTs)was epoxidized modification with silane coupling agent(KH560)and bisphenol A epoxy resin(E44),respectively.Then,the glass fiber reinforced composites were prepared by hot pressing with o-cresol epoxy resin(o-CFER).The structure and performance of MWCNTs/o-CFER la-mination nanocomposites were studied.The results showed that epoxy functional groups were successfully introduced into the surface of a-MWCNTs after reacting with KH560 and E44 respectively.Compared with a-MWCNTs without epoxidation,the thermal stability and glass transition temperature(Tg)of o-CFER laminated composites were improved by adding epoxidation modified carbon nanotubes,the crosslinking degree of the system was increased,and the mechanical properties showed a trend of first increase and then decrease.When the content of KH560-MWCNTs and E44-MWCNTs is 1%(Mass fraction,same below),the T g of the composites increases by 6.5℃and 9℃,respectively.The impact strength of KH560-MWCNTs modified system is the best,which improved 129.1%compared with glass fiber reinforced pure o-CFER when the content of KH560-MWCNTs is 1%.The tensile strength of E44-MWCNTs modified system is the best,and when the content of E44-MWCNTs is 1%,the tensile strength of the composite is increased by 29.9%compared with that of glass fiber reinforced pure o-CFER.SEM results show that the epoxy functionalized MWCNTs improve their dispersion in the o-CFER matrix,the interaction between matrix and reinforced fiber is enhanced.
作者
侯桂香
谢建强
姚少巍
韩卿
HOU Guixiang;XIE Jianqiang;YAO Shaowei;HAN Qing(Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials,College of Materials Science and Engineering,North China University of Science and Technology,063210 Tangshan,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第20期20165-20170,共6页
Materials Reports
基金
国家自然科学基金(51403050)。
